Pillar 3a for U.S. Citizens

A Swiss Pillar 3a can raise separate U.S. questions about the plan, treaty treatment, underlying investments and foreign-account reporting. Here's how to identify what needs review.

By Danilson Ramos · Founder, Atamatax

Published June 2026 · Updated September 2026

Part of the Switzerland desk — every US tax topic for Switzerland in one place.

A Pillar 3a is one of the best Swiss tax tools — but it's also where Americans most often discover a hidden PFIC problem. On Reddit and Swiss-FI forums the recurring line is blunt: the 3a isn't the problem, it's that most hold PFICs within them.

Cash 3a vs invested 3a

A 3a savings account holds cash — no PFIC, though it's still a reportable foreign account.
An invested 3a (VIAC, finpension, Frankly) may hold non-US pooled funds. Identify the funds and issuers; PFIC classification and Form 8621 filing are separate questions with their own tests.

Swiss tax treatment does not by itself determine the U.S. treatment of a Pillar 3a contribution, plan income or distribution. Review the plan terms and applicable treaty rules before taking a position.

Which providers even accept U.S. persons?

This is provider-specific and a moving target. finpension states it cannot offer its investment solution to U.S. persons — registration asks you to confirm you are not a U.S. person. Some U.S. persons report being able to open and invest a VIAC 3a, with the reporting burden on them. Confirm current terms with each provider.

An invested 3a may hold non-US pooled funds. Review each fund's legal structure and annual facts for PFIC treatment; the account wrapper does not automatically settle the analysis.

What to file for an invested 3a

Potential Form 8621 for each holding only if it is classified as a PFIC and a reporting trigger applies; election and exception rules matter.
FBAR / Form 8938 reporting of the account itself.
Whether the wrapper raises foreign-trust questions — a debated, fact-specific area.

Not sure if your 3a holds PFICs?

Pick your 3a provider in the free Swiss PFIC checker and see whether your account means Form 8621. This is general information, not individualised tax advice.

Check my 3a funds

Provider policies change — confirm with each provider. Atamatax provides preparation software and educational estimates, not individualised tax, legal, or investment advice.

Authorities cited

IRC §1297 — IRC §1297 — Definition of a passive foreign investment company
IRS Form 8621 — About Form 8621 — Information Return by a Shareholder of a PFIC or QEF
IRC §1291 — IRC §1291 — Interest on tax deferral (excess-distribution regime)
IRS Form 8938 — About Form 8938 — Statement of Specified Foreign Financial Assets
FinCEN Form 114 (FBAR) — Report of Foreign Bank and Financial Accounts (FBAR)
IRC §6048 — IRC §6048 — Information reporting for foreign trusts (Forms 3520 / 3520-A)

Primary sources (Cornell Legal Information Institute for the US Code and CFR; IRS.gov for forms, procedures, and treaty documents). This page is general information, not individualized tax or legal advice.

Atamatax provides tax preparation support and educational resources. This website does not constitute legal or tax advice.

Frequently asked questions

Can a U.S. citizen open a Pillar 3a?#

Some Swiss providers accept U.S. persons and some don't, largely due to FATCA — finpension, for example, states it cannot offer its investment solution to U.S. persons. Whether you should invest one is a separate question, given the PFIC exposure it creates.

Does my 3a reduce my U.S. taxes?#

Do not assume a Swiss contribution deduction is available on the U.S. return. The answer can depend on the plan's legal terms, the contribution and income involved, your facts, and any treaty provision. Have the plan documents reviewed before claiming a deduction or deferral.

Is an invested Pillar 3a a PFIC?#

The wrapper alone does not establish PFIC status. Identify each investment and issuer; a conventional non-US pooled fund may meet §1297, while a cash balance does not itself constitute a fund share. Whether Form 8621 is required then depends on holder-level triggers and exceptions. The account may raise separate FBAR or Form 8938 questions.

Do I report my 3a on the FBAR?#

Yes, if your combined non-U.S. financial accounts exceeded $10,000 at any point in the year — the FBAR is about the account, separate from the PFIC question.